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UNITED STATES- PATENT OFFICE.

ROBERT M'AO'KILL, or GLASGOW, SCOTLAND.

COMPOSITIONFORSHEEP-DIPPING.

SPECIFICATION forming part of Letters Patent No. 608,466, dated August2, 1898.

Application filed July 2'7, 1897. Serial No. 646,125. (No specimens.)

To all whom it mctyconcern:

Be it known that LRoBEnT MACKILL, a subject of the Queen of GreatBritain and Ireland, and a resident of Glasgow, Scotland, have inventedan Improved Composition for Sheep- Dipping and Analogous Purposes, ofwhich the following is a specification.

Myimproved composition is of a higher degree of efficiency and yieldsbetter and more reliable results than the compositions or substanceshitherto used for the like purposes.

The improved composition is a combination of cresylic acid or cresolwith nicotine and is prepared as hereinafter described.

Hitherto tobacco has been applied for similar purposes in various forms,such as tobacco powder, tobacco infusion, and tobacco extract, knownalso as tobacco juice, which is merely a decoction of tobacco or aninfusion of it in water and concentrated by evaporation. Thedisadvantages of these ordinary preparations are that, first, none ofthem contains more than a few units per cent. of nicotine, and even thatis not in afree state, but is combined with acids, such as citric acidand malic acid, forming salts or compounds-of nicotine which are of slowor feeble action as compared with the alkaloid in the free state;second, they consist, chiefly, of extractive and useless organic mattersand contain coloring-matters which discolor and deteriorate the wool;third, they are bulky, and it is therefore necessary to provide packagesand packing for transit by sea and over land for ten or twenty times theamount of material really required or that is effective, thus greatlyincreasing the cost.

In preparing my improved composition I take alkaloid nicotine (fromwhich acids and impurities have been separated as completely aspractically possible) and stir it continuously and thoroughly with therequisite quan titysay about an equal weightof cresylic acid, whereby Iobtain asubstance which has on a commercial scale and so that it can bea sold of a definite and uniform strength, and a definite strength ofsheep-dipping composition can be made with it Without the uncertaintyinseparable from the ordinary compositions.

What is obtainable commercially as lowpriced carbolic acid consists inreality of a large proportion of cresol or cresylic acid and may be usedas cresylic acid in making my improved composition.

What I claim is An improved composition for sheep-dipping and analogouspurposes and formed by combining cresylic acid or cresol withnicotinefrom which the other constituents of tobacco have been separated ascompletely as possible.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ROBERT MACKILL.

Witnesses WILLIAM HAS'IIE, GEORGE PATTERSON.

